Starting-switch for electric motors.



E. GARSIDE. STARTING SWITCH FOR ELECTRIC! MOTORS. APPLICATION FILED SEPTQB, 1909.

Y 'nmr mcw )NVENTOR: EDMUND GRRsmE. by AttOTfLeN.-

Patented Dec. 14,1909.

- switched on and in which thesivitch'is held UNITED sTnt 'ns r- TENT orr on.

EDMUND GARSIDE, or DARLr'NeToN, ENGLAND; AS-SIGNQR To ENGINEERING rNs'rnu- MENTS LIMITED, OF DARLINGTON, ENGLAND, A CORPORATION OF GREAT BRITAIN AND IRELND.

This invention relates to improvements in' starting switches for electric motors of that class in which a series of resistances are gradually cut out of the; motor circuit under dash-pot control when thecurrent is first on by a no volt release arrangement.

The object of the invention istoconstrnct such a device in a simple and efiective manner, with ;-little or no. risk of derangement and to be operated by a simple push into the closed position. a

In order that this invention may be the better understood, I will now proceed to describe the same, in relation to the accompanying drawing, ieiw'ence being. had to the letters marked thereon.

Like letters refer to like parts rious figures. i

Figure 1 is a front elevation of a switch made in accordance with my invention, the

in the va- .switch arm being shown in the OPGIL'POSI- tion. Fig. 2 is a side elevation of the same, partly in section, the switch arm being shown in dotted lines in the position in which the tripping action is about to commence.

Upon a suitable base a I pivot "a switch arm Z) having contacts 0 adapted to make contact with the main terminals 61. This switch arm is so hung upon its pivot, that when unrestrained it falls under the action of gravity into the open position. Upon the base a is also arranged a series of resistance contacts e connected up in the usual way with a series of resistances inclosed within the casing f.

Ij'he switch arm 5 is rovided with a mag:- netic armature g which co-acts with the poles h of vthe electric magnet i rigidly mounted on the base a, so that the'main switch is heldin the closed position electromagnetically so long as the electromagnet is properlyenergized.

Over the resistance contacts 6 the moving bridge contact j is adapted. to slide. The contact j, is rigidly mounted on ,a tube I which at its upper end slides on, and is guided by a cylindrical stem m while at the STARTING-SWITCH roe ELEcTRIcMoroas, j

Specification of Letters Patent. I Deg 14 1909, Application filed. September 8, 1 909. SerialNo. 516,680. I f

lower end the'piston n'withvalve'o isai-' ranged, "a spiral spring 70 being contained within the tube] so as 'to'force'the pistonn in a downward direction while reacting. against the cylindrical stem m, during which movement the resistances are being having a recess 8 at its outer end adapted to engage with the" roller t, pivotally mounted on'the sliding contacts j,';the' angle contained by the detent rand-switch-arm I) being such i that when the switch arm-bis pressed in thedirection to close the main switch such move ment is transmitted through the slidingcarrier j so as to raise it into the upper position on the resistance contacts 6, until nearing the end of its stroke, the bevel edge u of the detent 1 comes in contact with a pin 42 mounted on the rigid bracket to whereby the recess 8 is withdrawn from the roller 25, just at the.

point of closure of the main switch. When this takes placethe sliding contacts are gradually forced downward slowly by the spiral spring y) dnder the control of the liquidbeneath the piston n. The main switch remains in its closed position until the electromagnet z is short circuited or the current is out oii the main circuit from the source of supply. v

It will. be noted that unless the switch arm I) is drawn back sufficiently far to properly cause the detent 0' to engage the roller 2? in order to be in a position to put the resistances into the circuit, the beveled'ends of the detent 7* passes to the rear sideof the pin '2) and prevents the main switch being closed.

base, a switch arm. movable toward and v away from the said base, and pivoted to the latter, main terminals on said base, a contact on said switch arm and arranged to engage with the main terminals when the arm is moved toward the base, a series of resistance, terminals on the base, a dash pot superposed on the base directly above said resistance terminals, a piston working in said pot, a carriage fixed to the piston, a contact on said carriage and engageable with the resistance terminals, and means releasable to unite the carriage and the switch arm during the movement of the latter toward. the base.

2.111 a device- 0f the class described, a base, main terminals mounted thereon, reslstance terminals disposed on the base in substantial alinement with the main ter minals, displaceable means traveling above the reslstance terminals, a contact havm' connection with-the displaceable means-an engageable with the resistance terminals, and pivotal means on the base and having a contact for engagement with the main terminals upon movement in one direction of said pivotal means, and also having detachable con- :nection with the displaceablemeans to eflect engagement of the contact carried by the lat- 'ter with the resistance terminals during said movement of the pivotal means.

3. In a device of the class described, a

base, main terminals mounted thereon, re-

sistance terminals disposed on the base in substantial alinement with the main Iterminals, displaceablemeans traveling above the resistance terminals, a contact having connection with the displaceable means an engageable with the resistance terminals, pivotal means on the base and having a con-' tact for engagement with the main terminals upon movement in one direction of said pivot-al' means, and also havin detachable connection with the displacea le meansto effect engagement of the contact carried by the latter with theresistance-terminals during said movement of the pivotal means, a 1 lug-on the displaceable means and engageable and 'disengageable by said connectlon between the pivotal means and said dis laceable means, a-stop. to act upon the sai connection for releasing it' from the lug at apredetermined point of movement of said pivotal means, and means to restore the displaceable means to its primary position when I 

